The US fire service serves as the front line of defense against any domestic emergency and volunteer firefighters comprise the majority of firefighters, often with negative consequences for the health of personnel. While rates of overweight and obesity remain high among firefighters and cardiovascular disease remains the leading cause of line of duty deaths, few resources tailored to the unique culture and needs of firefighters are available to help occupational medicine physicians who provide their fitness for duty examinations. By engaging firefighters and occupational medicine clinicians in tailoring an internet/mobile intervention and pilot testing the program with a sample of volunteer firefighters, the investigators will be poised to implement a full-scale clinical trial with the developed program.